What is the average power supplied by a 60.0 kg secretary running up a flight of stairs rising vertically 4.0 m in 4.2 s?

If the speed of a particle triples ,by what factor does its kinetic energy increase?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?